/*
 * Copyright 2021  StreamSets Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.streamsets.pipeline.lib.config;

import com.streamsets.pipeline.lib.Constants;

import javax.ws.rs.client.ClientRequestContext;
import javax.ws.rs.client.ClientRequestFilter;
import java.io.IOException;
import java.util.function.Supplier;

public class UserAuthInjectionFilter implements ClientRequestFilter {
  private final Supplier<String> userAuthSupplier;
  private volatile String userAuth;

  public UserAuthInjectionFilter(Supplier<String> userAuthSupplier) {
    this.userAuthSupplier = userAuthSupplier;
  }

  public void filter(ClientRequestContext rc) {
    if (userAuth == null) {
      synchronized (this) {
        if (userAuth == null) {
          userAuth = userAuthSupplier.get();
        }
      }
    }
    rc.getHeaders().add(Constants.X_USER_AUTH_TOKEN, userAuth);
  }

}
